Hello Eric, sorry for the late reply.
The 4.1 manual was removed from the download page as most functions in Draken 5.0 are more or less identical to the FSX version.
The online version of the 4.1 manual is still available here:
The PDF version can be downloaded here:
Win 10 Pro | P3D v5, v4 | AMD Ryzen 3 3.5 GHz | 32 GB RAM | NVIDIA GT1030 | TM HOTAS Warthog | TM HOTAS Cougar